Harvesting Web Content into MHTML Archive

using System;
using System.Collections;
using System.Configuration;
using System.Xml;
using Rilling.MhtmlLib.Media.Handlers;

namespace Rilling.Web.Mhtml.Configuration
{
	/// <summary>
	///		Reads the mimeHandlers configuration settings from the app.config.
	///		Initializes all the configured <see cref="MimeHandleBase"/> object
	///		as defined in the app.config.
	/// </summary>
	public class MimeHandlersConfigurationHandler : IConfigurationSectionHandler
	{
		/// <summary>
		///		Initializes the <see cref="MimeHandlerBase"/> objects as defined
		///		in the app.config.
		/// </summary>
		/// <param name="parent">
		///		Not used.
		/// </param>
		/// <param name="input">
		///		Not used.
		/// </param>
		/// <param name="node">
		///		The Xml as laid out in the app.config.
		/// </param>
		/// <returns>
		///		A collection of <see cref="MimeHandlerBase"/> objects.
		/// </returns>
		public object Create(object parent, object input, XmlNode node)
		{
			if(node == null) throw(new ArgumentNullException("node"));
			ArrayList al = new ArrayList();

			foreach(XmlElement mimeHandlerNode in node.SelectNodes("add"))
			{
				if(mimeHandlerNode.Attributes["mimePattern"] == null)
					throw(new ConfigurationException("Required 'mimePattern' attribute missing from configuration section.", node));
				if(mimeHandlerNode.Attributes["type"] == null)
					throw(new ConfigurationException("Required 'type' attribute missing from configuration section.", node));

				string mimePattern =
					mimeHandlerNode.Attributes["mimePattern"].Value.Trim();
				Type mimeHandlerType = 
					Type.GetType(mimeHandlerNode.Attributes["type"].Value.Trim());

				if(mimeHandlerType != null)
				{
					foreach(string specificPattern in ExtractMimeAssociations(mimePattern))
					{
						//object[] args = new object[] { specificPattern };
						IContentFactory mh = (IContentFactory)Activator.CreateInstance(mimeHandlerType, null, null);

						//XmlNode settingParam = mimeHandlerNode.FirstChild;
						//if( settingParam != null )
						//    mh.Configure( (XmlElement)settingParam );

						al.Add(new MimeHandlerInfo(mh, specificPattern));
					}
				}

				// TODO:  Throw exception when type could not be loaded.
			}

			return al;
		}

		private string[] ExtractMimeAssociations(string mimePattern)
		{
			if(mimePattern == null || mimePattern.Trim() == String.Empty)
				throw(new ArgumentNullException("mimePattern"));

			return mimePattern.Split(',', ';');
		}
	}
}